• • The MT@MX heterojunction with stepped BIEF reduces LiPSs migration energy barriers, as evidenced by a capacity of 800 mAh g⁻¹ at a high sulfur loading of 6.4 mg cm⁻², demonstrating practical viability for high-energy-density cells.
• • Long-term cycling at 0.5 C shows a capacity degradation rate of only 0.078% per cycle over 300 cycles, indicating exceptional stability critical for commercial deployment.
• • The multi-interface design enhances LiPSs adsorption and catalysis, enabling uniform lithium deposition and dendrite suppression, which is essential for safe and long-life LSBs.
• • The facile redox synthesis of MT@MX offers a scalable route to fabricate advanced separator catalysts, potentially reducing manufacturing costs compared to complex multi-step processes.